Seems it was 1 corrupted entry that caused the whole issue.
I think you are correct. I created a new Google calendar with 3000 events and everything worked just fine so the number of events does not seem to cause the issue after all.

Can you give any details about the problematic event which might help with others to locate similar ones too? Was it a single or a recurring event? Was it originally created with Rainlendar or in the Google's website?

I have had the same problem since a week or two. I have tried reducing the number of entries, but it does not seem to make a difference. Perhaps I need to persevere, but I have limited the calendar to future events.
The log is attached.

Rainy wrote:Seems it was 1 corrupted entry that caused the whole issue.
I think you are correct. I created a new Google calendar with 3000 events and everything worked just fine so the number of events does not seem to cause the issue after all.

Can you give any details about the problematic event which might help with others to locate similar ones too? Was it a single or a recurring event? Was it originally created with Rainlendar or in the Google's website?

The event in question that got corrupted for me was a monthly re-occurring event with no end date

It was originally created on my android phone almost 6 months ago and had no issues until start of May so not sure why it got corrupted all of a sudden

Temp Fix: I got my Error msg problem to go away! Basically, I simply changed Import Limit for the calendar with the error to "Past 2 Years", and now no error. I changed setting back to its original "Everything" and the error returns. Actually, I found that any choice, other than Everything, results in no error.

Programmer: I think there is a problem with the dropdown tool for the Import Limit. While I was troubleshooting, I got the dropdown to display the list twice (see attached image). When I picked from the top/first list, I even got the field display to go blank. I'm guessing that the date range being queried from Google is blank or corrupted - thus the error message. I sure hope my temp fix helps others in the meantime. I love this app, but the missing calendar entries were killing me.